<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>2.32</title>
</head>

<body>
    <script>
        //ES5方式
        function join() {
            var str = "";
            for (var i = 0; i < arguments.length; i++) {
                if (i == 0) {
                    str = arguments[i];
                } else {
                    str += "|" + arguments[i];
                }
            }
            return str;
        }

        console.log(join("hello", "world"));
            //ES6方式
            function join2(...strs) {
                var str = "";
                for (var i = 0; i < strs.length; i++) {
                    if (i == 0) {
                        str = strs[i];
                    } else {
                        str += "|" + strs[i];
                    }
                }
                return str;
            }
    </script>
</body>

</html>